First Grow with some problems: Pineapple Express

The plant is not growing very fast. The overwatering really damaged it, and I repotted it in order to get the soil a bit dryer in the process. I also found some flies which apparently hatched in the compost, and due to the wet conditions multiplied fast... The temperatures are rising, and my hope is that it will push the growth. The goal for the next week is to save whatever I can. My original plan was to start flower after 6 weeks, but with this growth it doesn't seem possible. My learnings in the grow so far: Use a different substrate, and keep the plant as dry as possible.